$_POST
This YouTube video was created by Steve Griffith.
The $_POST variable is an associative array of variables passed to the current script via the HTTP POST method when receiving data from a form.
<?php
//
echo 'Hello, '.$_POST['name'];
?>
Assuming the following form was submitted:
<form method="post">
<input type="text" name="name" value="World">
</form>
The above example will output something similar to:
Hello, World